maybe a silly suggestion but how about having it run like the deserty one? (fallujah region?) have docks neutral and gas station neutral at start and once flags are capped they are capped, time for MEC to defend the next.
docks>gas station> park>mosque>market>hotel>street>construction>the ruins bit.
it might suck but certainly worth testing it on a server, it would solve the problem of US stuck on carrier with no chance and also may encourage some good city battles